package com.hmdp.service.impl;

import cn.hutool.core.bean.BeanUtil;
import cn.hutool.core.bean.copier.CopyOptions;
import cn.hutool.core.date.DateUtil;
import cn.hutool.core.util.RandomUtil;
import cn.hutool.jwt.JWT;
import cn.hutool.jwt.JWTUtil;
import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.hmdp.dto.LoginFormDTO;
import com.hmdp.dto.Result;
import com.hmdp.dto.UserDTO;
import com.hmdp.entity.User;
import com.hmdp.mapper.UserMapper;
import com.hmdp.properties.JwtProperties;
import com.hmdp.service.IUserService;
import com.hmdp.utils.JWTUtils;
import com.hmdp.utils.RedisConstants;
import com.hmdp.utils.RegexUtils;
import com.hmdp.utils.UserHolder;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.connection.BitFieldSubCommands;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Service;

import javax.servlet.http.HttpSession;
import java.nio.file.CopyOption;
import java.time.LocalDate;
import java.time.format.DateTimeFormatter;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.concurrent.TimeUnit;
import java.util.function.BinaryOperator;

import static com.hmdp.utils.RedisConstants.*;
import static com.hmdp.utils.SystemConstants.USER_NICK_NAME_PREFIX;

/**
 * <p>
 * 服务实现类
 * </p>
 *
 * @author 虎哥
 * @since 2021-12-22
 */
@Slf4j
@Service
public class UserServiceImpl extends ServiceImpl<UserMapper, User> implements IUserService {

    @Autowired
    private StringRedisTemplate stringRedisTemplate;

    @Override
    public Result sendCode(String phone, HttpSession session) {
        // 1.校验手机号
        if (RegexUtils.isPhoneInvalid(phone)) {
            // 2.不符合 ： 返回错误信息
            return Result.fail("手机号格式有误，请重新输入！");
        }
        // 3.符合。生成验证码
        String code = RandomUtil.randomNumbers(6);
        // 4.保存在session中  ---> redis中
        stringRedisTemplate.opsForValue().set(LOGIN_CODE_KEY + phone, code, LOGIN_CODE_TTL, TimeUnit.MINUTES);

        log.debug("发送验证码成功，验证码为:{}", code);

        // 5.返回OK
        return Result.ok(code);
    }

    @Override
    public Result login(LoginFormDTO loginForm, HttpSession session) {
        //1.校验手机号
        String phone = loginForm.getPhone();
        if (RegexUtils.isPhoneInvalid(phone)) {
            return Result.fail("手机号格式错误！");
        }
        //2.检验验证码
        //3. 从redis中获取验证码
        String cacheCode = stringRedisTemplate.opsForValue().get(LOGIN_CODE_KEY + phone);
        String code = loginForm.getCode();
        if (cacheCode == null || !cacheCode.equals(code)) {
            return Result.fail("验证码错误");
        }
        // 4.一致，根据用户查询
        User user = query().eq("phone", loginForm.getPhone()).one();
        // 5. 判断用户是否存在
        if (user == null) {
            // 6. 不存在，创建新用户并保存
            user = createUserWithPhone(loginForm.getPhone());
        }
        // 7. 保存用户信息到redis中
        Map<String, Object> claims = new HashMap<>();
        claims.put("userId", user.getId());
        //  7.1 生成token  作为登录令牌
        String token = JWTUtils.createJWT("itheima", 1800000, claims); // 30分钟
        //  7.2 将User对象转为HashMap存储
        UserDTO userDTO = BeanUtil.copyProperties(user, UserDTO.class);
        Map<String, Object> userMap = BeanUtil.beanToMap(userDTO, new HashMap<>(),
                CopyOptions.create()
                        .setIgnoreNullValue(true)
                        .setFieldValueEditor((fieldName, fieldValue) -> fieldValue.toString()));
        // 7.3 存储
        String tokenKey = LOGIN_USER_KEY + token;
        stringRedisTemplate.opsForHash().putAll(tokenKey, userMap);
        // 7.4 设置token过期时间
        stringRedisTemplate.expire(tokenKey, LOGIN_USER_TTL, TimeUnit.SECONDS);

        return Result.ok(token);
    }

    /**
     * 用户签到
     *
     * @return
     */
    @Override
    public Result sign() {
        //获取当前用户
        Long userId = UserHolder.getUser().getId();

        //获取日期
        LocalDate now = LocalDate.now();
        String keySuffix = now.format(DateTimeFormatter.ofPattern(":yyyyMM"));

        //拼接key
        String key = USER_SIGN_KEY + userId + keySuffix;

        //获取今天是本月的第几天
        int day = now.getDayOfMonth();

        //写入redis   setbit key offset 1
        stringRedisTemplate.opsForValue().setBit(key, day - 1, true);
        return Result.ok();
    }

    @Override
    public Result signCount() {
        //获取当前登录用户
        Long userId = UserHolder.getUser().getId();
        //获取本月截止今天为止所有的签到记录
        //获取日期
        LocalDate now = LocalDate.now();
        String keySuffix = now.format(DateTimeFormatter.ofPattern(":yyyyMM"));
        String key = USER_SIGN_KEY + userId + keySuffix;
        int dayOfMonth = now.getDayOfMonth();
        List<Long> result = stringRedisTemplate.opsForValue().bitField(
                key,
                BitFieldSubCommands.create()
                        .get(BitFieldSubCommands.BitFieldType.unsigned(dayOfMonth)).valueAt(0)
        );

        if (result == null || result.isEmpty()) {
            //没有任何签到 结果
            return Result.ok(0);
        }
        Long num = result.get(0);
        if (num == null || num == 0) {
            return Result.ok(0);
        }
        //循环遍历
        int count = 0;
        while (true) {
            //让这个数字与1做 与 运算 ，得到最后一个bit位   判断最后一个比特位是否等于0
            if ((num & 1) == 0) {
                //如果为 0  说明未签到 结束
                break;
            } else {
                //如果不为 0  说明已签到 +1
                count++;
            }
            // 把数字右移一位。抛弃最后一个bit位，继续下一个bit位
            num >>>= 1;
        }

        return Result.ok(count);
    }

    private User createUserWithPhone(String phone) {
        User user = new User();
        user.setPhone(phone);
        user.setNickName(USER_NICK_NAME_PREFIX + RandomUtil.randomString(8));
        save(user);
        return user;
    }
}
